Optical articles comprising encapsulated microlenses and methods of making the same

Patent metadata

Field	Value
Publication number	US-12162230-B2
Application number	US-201917286259-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Oct 17, 2018
Publication date	Dec 10, 2024
Grant date	Dec 10, 2024

Abstract

The present disclosure includes optical articles comprising a lens having first and second lens surfaces and a protective layer having first and second protective surfaces that is coupled to the lens such that the first protective surface is disposed on the second lens surface. The optical article can comprise a plurality of convex or concave optical elements defined on the second lens surface or the first protective surface. The protective layer can have a maximum thickness larger than a maximum height of each of the optical elements such that the protective layer encapsulates the optical elements.

First claim

The invention claimed is:

1. An optical article comprising:
a lens having opposing first and second lens surfaces; and
a protective layer having opposing first and second protective surfaces and a maximum thickness, measured in a direction perpendicular to the first protective surface between the first and second protective surfaces, the first protective surface disposed on the second lens surface;
wherein the lens further comprises a plurality of convex optical elements, each of the plurality of convex optical elements being an integral part of the lens such that each convex optical element defines a portion of the second lens surface,
each of the plurality of convex optical elements has a maximum height, measured in a direction perpendicular to the first protective surface, that is less than or equal to 0.1 millimeters (mm) and a diameter that is less than or equal to 2.0 mm, and
the maximum thickness of the protective layer is larger than the maximum height of each of the optical elements such that the optical elements are encapsulated within a volume defined between the second protective surface and the first lens surface.

2. The optical article of claim 1 , wherein:
the lens comprises a first material having a first index of refraction; and
the protective layer comprises a second material having a second index of refraction lower than the first index of refraction.

3. The optical article of claim 1 , wherein:
the protective layer comprises glue; and
the optical article comprises a film disposed on the second protective surface.

4. The optical article of claim 1 , wherein the protective layer comprises one or more coatings, at least one of the coating(s) comprising a polyurethane coating, a scratch-resistant coating, an antireflective coating, a photochromic coating, an anti-smudge coating, an anti-fog coating, a tintable coating, a self-healing coating, an anti-rain coating, an anti-static coating, an anti-UV coating, or an anti-blue light coating.

5. The optical article of claim 1 , wherein
the lens comprises a first material having a first index of refraction; and
the protective layer comprises a second material having a second index of refraction higher than the first index of refraction.

6. The optical article of claim 1 , wherein:
the second protective surface is convex; and
the first protective surface is concave.

7. A method of forming an optical article, the method comprising:
moving first and second primary mold portions of a first mold from an open position to a closed position in which the primary mold portions cooperate to define a first mold cavity, each of the primary mold portions defining a molding surface;
introducing a first moldable material into the first mold cavity; setting the first moldable material to form a first optical member having opposing first and second optical surfaces, wherein the molding surface of the second primary mold portion defines a plurality of concave recesses or a plurality of convex protrusions such that the second optical surface defines a plurality of convex or concave optical elements, each having:
a maximum height, measured in a direction perpendicular to the second optical surface, that is less than or equal to 0.1 millimeters (mm); and
a diameter that is less than or equal to 2.0 mm; and
coupling a second optical member to the second optical surface, the second optical member having a maximum thickness, measured in a direction perpendicular to the second optical surface between first and second surfaces of the second optical member, that is larger than the maximum height of each of the optical elements such that the optical elements are encapsulated within a volume defined between the second surface of the second optical member and the first optical surface.

8. The method of claim 7 , wherein the coupling comprises:
placing the first optical member on a second mold comprising first and second secondary mold portions such that the first optical surface is disposed on a molding surface of the first secondary mold portion;
after the placing, moving the secondary mold portions from an open position to a closed position in which the secondary mold portions cooperate to define a second mold cavity that is larger than the first optical member such that a volume is defined between the second optical surface and a molding surface of the second secondary mold portion;
introducing a second moldable material into the volume; and
setting the second moldable material to form the second optical member such that the second optical member is coupled to the first optical member and encapsulates the optical elements.

9. The method of claim 8 , comprising:
placing the first and second optical members on a third mold comprising first and second tertiary mold portions such that the first optical surface is disposed on a molding surface of the first tertiary mold portion;
after the placing, moving the tertiary mold portions from an open position to a closed position in which the tertiary mold portions cooperate to define a third mold cavity, wherein the third mold cavity is larger than the first and second optical members such that a volume is defined between the second surface of the second optical member and a molding surface of the second tertiary mold portion;
introducing a third moldable material into the volume; and
setting the third moldable material to form a third optical member that is coupled to and disposed on the second surface of the second optical member;
wherein the third moldable material is the same as the first moldable material.

10. The method of claim 8 , wherein:
the molding surface of the first primary mold portion is convex such that the first optical surface is concave; and
the molding surface of the second primary mold portion:
is concave such that the second optical surface is convex; and
defines a plurality of concave recesses such that each of the optical elements is convex.

11. The method of claim 10 , comprising, before placing the first optical member on the second mold, bending and thereby inverting the first optical member such that the first optical surface is convex and the second optical surface is concave.

12. The method of claim 10 , wherein the first moldable material has a first index of refraction and the second moldable material has a second index of refraction lower than the first index of refraction.

13. The method of claim 7 , wherein the coupling comprises applying one or more coatings to the second optical surface such that the coating(s) define the second optical member, at least one of the coating(s) comprising a polyurethane coating, a scratch-resistant coating, an antireflective coating, a photochromic coating, an anti-smudge coating, an anti-fog coating, a tintable coating, a self-healing coating, an anti-rain coating, an anti-static coating, an anti-UV coating, or an anti-blue light coating.

14. An optical article comprising:
a lens having opposing first and second lens surfaces; and
a protective layer having opposing first and second protective surfaces and a maximum thickness, measured in a direction perpendicular to the first protective surface between the first and second protective surfaces, the first protective surface disposed on the second lens surface,
wherein the protective layer further comprises a plurality of concave optical elements, each of the plurality of concave optical elements being an integral part of the protective layer such that it defines a portion of the first protective surface,
each of the plurality of concave optical elements has a maximum height, measured in a direction perpe

Assignees

• Essilor Int

Inventors

• Guillot Matthieu
• Meynen Mathieu
• Chiu Hao-Wen
• Plessis Christophe
• Marchal Jeanne
• Drobe Bjorn

Classifications

• B29D11/0048

  Moulds for lenses (moulds for plastic articles in general B29C33/00) · CPC title

• G02B3/0031

  Replication or moulding, e.g. hot embossing, UV-casting, injection moulding · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• B29D11/00009

  Production of simple or compound lenses · CPC title